Original problem was no front led light lit when powered on. No audio signal passed through to speaker with it on or off...
Took apart, verified 9VDC was coming in, but was not dropping any voltage. Noticed a lot of the solder joints looked poor. So I touched up the solder connections on board.
Now, power is going through circuit, diode dropping .5 V, but front panel LED still not coming on, and speaker 'hums'. When off, can hear audio very weakly through speaker. (using a handheld radio for signal)
Since have an Oscope at work, followed wires to chip with power off, and audio signal is present at chip, a KA 2006.
When powered on, just get big sine wave on Oscope, and lose audio. No response from volume pot.
Desoldered the KA 2006 chip, will try to purchase locally, but am wondering is there anything I may have missed? No signs of burnt parts.
Any help is greatly appreciated.
Thank you.
Jay